feedstuff additive Zinc oxide feedstuff additive . PropertiesMolecular formula ZnO Molecular weight: 81.39 white /slight yellow fine powder , specific gravity 5.56.5 , granularity 0.150.7um , refractive index is 1.952.05 , specific heat in 20 0.0915 ka. /g. , melting point 1973 , Zinc oxide evaporates in 1000 . Standard Company standard:HHXPQBYHXSLTJJ2005 Technical index: Item 1# 2# Zinc oxide ( ...